Odin Error: "Can't open the serial(COM) port"

Hello everyone, I hope this is in the correct section but if it's not I apologize.

I recently bought a new phone, and it finally arrived. The phone I have is the Samsung Galaxy S3, the model number according to my settings is GT-i9305T. Ofcourse, I want to root it and flash a custom ROM so it'll run as well as it possibly can, however when I try to use CF Autoroot with Odin I get the error described in the title of this thread.

I have tried using a different USB port on this computer, and I've had no luck. The phone is recognized by Kies, and the drivers were all installed through it.

Now, does anyone have any suggestions? I've been trying to do it with Odin 1.85 and "CF-Auto-Root-m3-m3dv-gti9305t", which appears to be everyone's go-to method for rooting this phone. I really have no idea what else I could try.

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